Josephson Vortex Dynamics in Tilted Magnetic Fields

진용덕,기동근,이후종,Jin, Yong-Duk,Ki, Dong-Keun,Lee, Hu-Jong The Korean Superconductivity Society 2008 Progress in superconductivity Vol.9 No.2

We report on the Josephson vortex dynamics in $Bi_2Sr_2CaCuO_{8+\delta}$ natural Josephson junctions by c-axis tunneling measurements. Beside the quasiparticle branches in the current-voltage characteristics, a new set of multiple branches, referred to as Josephson-vortex-flow branches (JVFBs), are observed. The JVFBs emerge in an in-plane magnetic field above $H_0\;=\;{\Phi}_0/{\gamma}s^2$ and show highly hysteretic behavior, which can be explained in terms of the recently proposed dynamic-phase-separation model. In this work we examined the effect on the JVFBs by the presence of pancake vortices generated as the external magnetic field was applied slightly tilted from the in-plane direction. JVFBs were found to become larger and prominent with increasing pancake vortex density as the tilt angle increased, which were presumably caused by slowing down of a Josephson vortex lattice in the presence of pancake vortices.

농약살포액의 이화학적 특성과 생물활성 변화

진용덕(Yong-Duk Jin),이상범(Sang-Bum Lee),이상계(Sang-Guei Lee),오병렬(Byung-Youl Oh) 한국농약과학회 2005 농약과학회지 Vol.9 No.4

This study was carried out to establish rational methodologies for the use of pesticide formulations to be sprayed after water-dilution. Hardness and electric conductivity of six major river water and ground water sampled from 52 sites in major rice-growing areas across the country ranged from 5 to 324 ppm(av. 90 ppm) and from 0.038 to 1.078 dS/m(av. 0.265 dS/m), respectively, which are acceptable for diluent water of pesticides. The pH changes in pesticide spray solutions with time after preparation mainly depended on the pH of the water used for pesticide dilution. The surface tensions of pesticide spray solutions reduced slightly with time after preparation, irrespective of kinds of pesticide formulations. Suspensibility of WPs became worse with an increase in the hardness and salt concentrations of diluent water, even though the degree was negligible. Emulsion stability of ECs became worse with an increase in hardness and salt concentrations of diluent water. Degradation rates of the active ingredients of pesticide spray solutions 3 days after preparation were less than 5%, regardless of mixing or non-mixing of two or more pesticides. Consequently, the spray solutions of most pesticides were usable until two to three days after preparation unless physical properties deteriorated. The tank-mixing order of EC and WP formulations did not make any differences in all the physical properties of pesticide spray solutions. However, the proper order for the tank-mixing of compatible pesticides was WP, WG, SC, EC, and SL, because the order is easy to prepare the pesticide spray solutions. The efficacy of pesticide spray solutions on the respective target pathogens and insect pests of rice plants three days after preparation was recorded over 95% of that of 0 day, which was almost the same as that of the solutions applied punctually after preparation.

Adjuvant에 의한 농약살포액의 물리성 개선 및 약효증진 효과

진용덕(Yong-Duk Jin),이희동(Hee-Dong Lee),유오종(Oh-Jong You),김진배(Jin-Rae Kim),권오경(Oh-Kyung Kwon) 한국농약과학회 2008 농약과학회지 Vol.12 No.4

This study was carried out to elucidate the effects of adjuvants on physicochemical properties and pest control efficacy of pesticide spray solution. Spray droplet sizes of pesticide solution decreased by addition of adjuvants even though its effect varied according to the pesticides. The adhesive effect of pesticides sprayed on target crops by addition of adjuvants varied according to the properties, the application methods, and the spray volume of pesticides. Wash-off of the deposited amount of active ingredients of the solution of tricyclazole WP and fenobucarb EC by simulated rainfall after spraying on rice plants dramatically reduced by adding adjuvants. The retained amount of active ingredients of the pesticides were 1.5~4.1 times higher than those without adjuvants when subjected to simulated rainfall 6 hours after spraying. Addition of adjuvants to the propanil EC spray solution enhanced the control efficacy in barnyard grass, Echinocloa crus-galli Beauv. by 8~30%, which showed a potential to reduce pesticide use.

포도 중 Thiacloprid와 Lufenuron의 유/무대 차이에 따른 잔류량 비교

진용덕(Yong-duk Jin),임성진(Sung-Jin Lim),김상수(Sang-Su Kim),최근형(Geun-Hyoung Choi),이학원(Hak-won Lee),정두연(Du-yun Jeong),문병철(Byung-Cheol Moon),노진호(Jin-ho Ro) 한국농약과학회 2017 농약과학회지 Vol.21 No.1

This study was conducted to compare the effect of bagging technique on the presence of pesticide residues in various parts of grape fruit (whole fruit, pulp and peel). The tested pesticides were diluted at 2,000 times and sprayed three times onto the crops at an interval of seven days and then they were collected at 0, 1, 3, 5 and 7 days after final application. Later, bagging/non-bagging samples were pre-treated with fruit, pulp and peel samples, respectively. Thiacloprid and lufenuron were not detected in any of the bagging samples. The thiacloprid residues of non-bagging samples in whole, peel and pulp samples were 0.47-1.09, 0.18-0.33 and 1.24-1.67 mg/kg, respectively. The lufenuron residues of non-bagging samples in whole fruit, peel and pulp samples were 0.16-0.62, < LOD-0.08 and 0.85-1.48 mg/kg, respectively. The biological halflives of thiacloprid and lufenuron in whole fruit, peel and pulp of non-bagging samples were 5.7, 15.1 and 7.8 days and 4.0, 9.4 and 2.6 days, respectively. While the unbagged samples showed a sequential decrease in pesticide residues, this study concludes that bagging would be an effective method to protect the presence of thiacloprid and lufenuron residues in grape fruits.

헬기를 이용한 항공살포 농약의 비산 및 분포 특성

진용덕(Yong-Duk Jin),이희동(Hee-Dong Lee),박연기(Yeon-Ki Park),김진배(Jin-Bae Kim),권오경(Oh-Kyung Kwon) 한국농약과학회 2008 농약과학회지 Vol.12 No.4

This study was carried out to assess adoptability and environment impacts of ultra low volume (ULV) pesticide spray solutions aerially sprayed by manned-helicopter. Uniformity of the deposited amount in paddy fields was uneven, showing 3.1~4.7 times differences among surveyed sites. Drifting distance of aerially sprayed droplets from the target area was within 30 m in the wind direction and 20 m in the opposite direction. Most of the aerially sprayed pesticides were deposited in/on rice plants, while those in submerged paddy water and soil were relatively small. The degradation rate of the deposited pesticides was in the decreasing order of rice plants, paddy water and soil. Soil residues of pesticides in the aerially sprayed rice paddy fields after harvest ranged from non-detected to 0.201 ㎎/㎏. However, no pesticides were detected in brown rice and rice straw. No phytotoxic symtoms were observed in rice plants and nearby non-target crops by the sprayed pesticides.

02 초청강연 : 초청강연 7 ; 수출농산물 안전성관리의 문제점 및 대응방안

진용덕 ( Yong Duk Jin ) 한국환경농학회 2015 한국환경농학회 학술대회집 Vol.2015 No.-

항공방제용 농약의 혼용가능 조합 선발 및 생물효과

진용덕(Yong-Duk Jin),이희동(Hee-Dong Lee),심홍식(Hong-Sik Shim),이상계(Sang-Guei Lee),권오경(Oh-Kyung Kwon) 한국농약과학회 2008 농약과학회지 Vol.12 No.4

This study was conducted to select excellent tank mix combinations of pesticides for aerial application by manned helicopter. Among 209 pesticide combinations of 3-way tank-mixing for aerial application, a total of 93 recommendable combinations including tricyclazole SC+validamycin-A SL+imidacioprid SL were finally selected for the simultaneous control of key pests on paddy rice such as blast, sheath blight, brown planthopper and moth. The selected combinations were not phytotoxic to rice plants and nearby non-target crops, and excellent in physicochemical properties of ultra low volume (ULV) spray solutions. The efficacies on sheath blight, brown planthoppers and white-backed planthoppers of pesticides sprayed by aerial application were similar to those of pesticides by conventional spraying. Total cost of aerial application in paddy rice was very economical as one fourth level of that of conventional spraying.

중국 수출용 쌀의 중금속 안전성 평가

김경진 ( Gyeong-jin Kim ),양애리 ( Ae-li Yang ),김진배 ( Jin-bae Kim ),진용덕 ( Yong-duk Jin ),노진호 ( Jin-ho Ro ),김단비 ( Dan-bi Kim ),류지혁 ( Ji-hyock Yoo ),오경석 ( Kyeong-seok Oh ),문병철 ( Byeong-churl Moon ),박상원 ( Sang 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-

2016년에 대중국 쌀 수출길이 열리면서 낮은 인지도 및 고가격 대비 차별성을 극복하기 위해서 고품질 쌀 생산 및 가공기술과 더불어 안전성 확보는 필수요소가 되었다. 중국의 식품안전법에 근거로 한 새로운 食品中汚染物限量(GB2762-2012, 2013.6.1.)에 규정된 중금속 안전관리 기준에 맞는 쌀 생산을 위하여 6개 시군(철원, 이천, 청주, 서천, 군산, 해남)의 중국 수출용 쌀 생산단지에서 농경지 토양, 농업 용수 및 생산된 쌀을 채취하여 중금속을 분석하였다. 수출용 쌀 생산단지 토양의 비소 함량은 2.9~18.2 mg/kg 범위로 검출되어 환경오염 우려수준인 25 mg/kg 이하였으며, 카드뮴은 모든 시료에서 정량한계 수준인 0.006 mg/kg 이하로 검출되지 않았다. 구리는 충남 서천 지역에서 최고 25.6 mg/kg이 검출되었으나 토양오염 우려기준 250 mg/kg의 약 1/10수준으로 안전하였다. 그리고 니켈, 납, 아연, 6가크롬 등 분석한 8종의 중금속이 토양오염우려기준 보다 낮게 검출되어 안전한 수준임이 확인되었다. 농업용 수 중 비소의 잔류량은 하천수에서 최고 24.3 ug/L으로 상대적으로 많은 양이 검출되었으나, 지하수는 대부분 1~2 ug/L 수준으로 검출되어 농업용수의 수질기준(0.05 mg/kg)을 초과하지 않았다. 백미와 현 미 중 중금속 5종을 분석한 결과 수은과 크롬은 정량한계 미만이었으며, 카드뮴은 0.004~0.068 mg/kg 이 검출되어 한국과 중국의 잔류허용기준인 0.2 mg/kg 이하였다. 또한 백미 중 납은 0.002~0.136 mg/kg 범위로 우리나라의 백미 기준 0.2 mg/kg, 중국 현미 기준 0.2 mg/kg 이하로 안전하였다. 전반 적으로 쌀 중 비소 등 5종의 중금속 잔류량은 한국과 중국의 잔류허용기준의 1/10~1/20 수준으로 안전 하였다.

현미 도정과정에 따른 살균제 Hexaconazole, Tricyclazole 및 살충제 Etofenprox, Imidacloprid 잔류량 변이

노진호(Jin-ho Ro),임성진(Sung-Jin Lim),진용덕(Yong-duk Jin),김단비(Danbi Kim),최근형(Geun-Hyoung Choi),김상수(Sang-Su Kim),이학원(Hak-won Lee),박지현(Ji-hyun Park) 한국농약과학회 2017 농약과학회지 Vol.21 No.3

This study was performed to elucidate pesticide residues of hexaconazole, tricyclazole, etofenprox and imidacloprid in polished and unpolished rice. The pesticides were sprayed two and three times onto the crops at recommended and double dose, and the residue of them were determined in polished and unpolished rice after harvested. Hexaconazole residues of polished and unpolished samples were <LOD-0.04 and <LOD-0.09 mg/kg, respectively. Tricyclazole residues of polished and unpolished samples were 0.17-0.88 and 0.32-1.37 mg/kg, respectively. Etofenprox was not detected on polished samples at recommended and double dose, but the residues in unpolished samples were 0.03-0.26 mg/kg. Imidacloprid residues of polished and unpolished samples were <LOD-0.02 and <LOD-0.07 mg/kg, respectively. The pesticide residues were notably decreased in polished rice. These results showed that polishing would be an effective method to reduce the residue of hexaconazole, tricyclazole, etofenprox and imidacloprid residues in rice.

마늘 저장 중 부패병 방제를 위하여 처리한 농약의 경시적 농약 잔류량 평가

유오종(Oh Jong You),진용덕(Yong Duk Jin),황세구(Se Gu Hwang),이용훈(Yong Hoon Lee),임양빈(Yang Bin Ihm),김진배(Jin Bae Kim),권오경(Oh Kyung Kwon),경기성(Kee Sung Kyung),김장억(Jang Eok Kim) 한국농약과학회 2009 농약과학회지 Vol.13 No.3

We tested and selected some agrochemicals reducing the occurrence of major pests and diseases during garlic storage. Tebuconazole, diphenylamine and prochloraz as fungicides and dimethate as a insecticide were sprayed or drenched before harvest. And the harvested garlic was dipped in each of the agrochemicals. The residues of pesticides in garlic bulbs treated were analyzed every month from harvesting time for 6 months. In case of Danyang garlic, which was treated with pesticides before and after harvesting, the residues of diphenylamine, tebuconazole, prochloraz, and dimethoate ranged from 0.008 to 0.28, from 0.03 to 0.32, from 0.02 to 0.12, and from 0.02 to 0.25 ㎎/㎏, respectively. In case of Uiseong garlic, the residues of diphenylamine, tebuconazole, prochloraz and dimethoate ranged from 0.008 to 0.09, from 0.08 to 0.45, from 0.02 to 0.57, and from 0.04 to 0.38 ㎎/㎏, respectively. And, in case of Namdo garlic, the residues of diphenylamine, tebuconazole, prochloraz, and dimethoate ranged from 0.008 to 0.52, from 0.07 to 1.67, from 0.02 to 0.17, and from 0.03 to 0.73 ㎎/㎏, respectively. Some of the garlic samples treated with tebuconazole exceeded its maximum residue limits (MRLs) of 0.1 ㎎/㎏ set by Korea Food Drug Administration (KFDA), but dimethoate was detected below its MRL of 1.0 ㎎/㎏. In case of diphenylamine and prochloraz, their MRLs for garlic were not set. Adapting their MRLs, 5.0 ㎎/㎏ of diphenylamine for apple and pear and 0.5 ㎎/㎏ of prochloraz for strawberry and grape, residue levels of diphenylamine and procloraz were below than their MRLs, with the exception of samples two times treated with procloraz in Namdo garlic. These results indicate that dimethoate can be used as an agrochemical to control the postharvest disease in garlic in only MRL aspect.